Lathe-qhuck



UNITED STATES PATENT OFFICE.

AMOS HENRY STETSON, OF BROOKLINE, MASSACHUSETTS.

LATHE-CHUCK.

SPECIFICATION forming part of Letters Patent No. 354,266, dated December 14, 1886.

Application filed September 30, 1886. Serial No. 214,947. (No model.)

To aZZ whom, it may concern.-

Be it known that I, AMOS HENRY STETSON, of Brooklinc, in the county of Norfolk, of the Commonwealth of Massachusetts, have invented a new and useful Improvement in Lathe-Chucks; and I do hereby declare the same to be described in the following specification, and represented in the accompanying drawings, of which Figure 1 is a top view, Fig. 2 a side elevation, Figs. 3 and 4 opposite end views, Fig. 5 a vertical median and longitudinal section, and Fig. 6 a horizontal section, of a lathe chuck embodying my invention, the nature of which is defined in the claims hereinafter presented. Fig. 7 is atop view, Fig. 8 a side elevation, and Fig. 9 a front end view, of one of the jaws of such chuck.

In the said drawings, A and A are two jaws, which, arranged as represented, are

adapted to slide rectilincarly within a frame.

or carrier, B, properly channeled to receive them. Each of these jaws has one of two separate screws, 0, for moving it, the screw screwing into and through an ear, a, projecting from the jaw. These screws are arranged parallel to and apart from each other and are pivoted within the frame, so as to enable each to be revoluble on its axis. On the shank of one of such screws there is fastened a spurgear, b, that engages with another such gear, 0, revoluble on the other shank, but held from revolving thereon by a key, (I, that is inserted within the grooves m n in the gear and the shank, such key being removable from the shank and gear through one end of the frame. Each shank,where projecting beyond the said frame, is formed prismatic, as shown at e, to admit of a wrench or key being used thereon for revolving the shank. When either shank is so revolved and the gear 0 is keyed to its screw -shank, both screws will be simultaneously revolved, and the jaws will be moved either toward or away from each other, according to the direction of revolution of the shank; but on the key being withdrawn from the gear 0 and its shank either jaw maybemoved independently of the other,

which itis very convenient to do sometimes, especially in chucking irregular work.

The gears are arrangedwithin a close chamber, f, arranged within the carrier B and entirely insulated from the groove or opening 5 in such carrier, in which the jaws move, such chamber being to prevent any chips, turnings, or borings from getting upon the gears while the chuck may be in use.

The frame or carrier B is provided at its back with a tubular extension, h, which is screw-threaded or grooved in its bore, in order to enable the frame or carrier to be screwed upon the mandrel of a lathe.

Each jaw has on its inner face a notch, 1', extending down through it, such notch being right-angled in transverse section.

By having the jaw actuating screws arranged at a distance apart from each other an article inserted between the jaws and held by them can be extended between the screws, which oftentimes is a matter of great convenience.

At each end of the frame B there is a cap and having a gear fastened on the shank of one of such screws and another gear revoluble on the shank of the other screw, and held thereto by a key arranged in such gear and. shank and removable therefrom, all being substantially as set forth.

3. The combination of the jaw carrier, channeled to hold the two jaws and guide them in their rectilinearmovements, and provided with the gearinsulating chamber separate from the space in which the gears work, with the said jaws arranged in such space and projecting fromusuch carrier, as repreor grasping faces, as shown, of the two sepasented, and with the two actuating-jaw screws ratejaw-actuating screws arranged in such IO and their connecting-gears applied to their carrier and provided with connecting gears, shanks, such gears being within such insulatsubstantially as set forth. ing-chamber, and all being substantially as set AMOS HENRY STETSON. forth. I Cit-nesses:

4. The combination, with the jaw-carrier R. H. EDDY,

and with the two jaws recessed in their inner V R. B. TORREY. 

